s3m2nsf converts s3m files made with a special samplepack to nsf. so, it's a way to make nsf files in your favorite s3m-compatible tracker.
s3m2nsf supports the VRC6 expansion chip (it's enabled if the VRC6 samples are present)
At this time, there is no alternative download link for s3m2nsf, because nintendev.com now points to something dangerous. It has now been replaced with an archive.org link.
archived page for s3m2nsf
s3m2nsf automatically converts samples at the end into DPCM, so you might need this tool to convert .dmc samplepacks to raw samples:
Sorry, dmc2wav was not archived. The original link is still an error 404.